PHP image compression implementation code-PHP Tutorial-php.cn

/*
Function: Adjust image size or generate thumbnail
Return: True/False
Parameters:
$Image The image that needs to be adjusted (including path)
$Dw =450 The maximum width when adjusting; the absolute width when thumbnailing
$Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
$Type=1 1, adjust the size; 2, generate thumbnails
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*/
$path='img/';//path
$phtypes=array(
'img/gif',
'img/jpg' ,
'img/jpeg',
'img/bmp',
'img/pjpeg',
'img/x-png'
);
FunctionImg($Image,$Dw =450,$Dh=450,$Type=1){
IF(!File_Exists($Image)){
ReturnFalse;
}
#If you need to generate a thumbnail, copy the original image and re-assign $Image
IF($Type!=1){
Copy($Image,Str_Replace(".","_x.",$Image));
$Image=Str_Replace(".","_x.",$Image);
}
#Get the file type and create different objects according to different types
$ImgInfo=GetImageSize($Image);
Switch($ImgInfo[2]){
Case1:
$Img =@ImageCreateFromGIF($Image);
Break;
Case2:
$Img =@ImageCreateFromJPEG($Image);
Break;
Case3:
$Img =@ImageCreateFromPNG($Image);
Break;
}< ;/p>
#If the object is not created successfully, it means it is not an image file
IF(Empty($Img)){
#If there is an error when generating thumbnails, you need to delete the copied files
IF($Type!=1){Unlink($Image);}
ReturnFalse;
}
#If the resize operation is performed,
IF($Type==1){
$w=ImagesX($Img);
$h=ImagesY($Img);
$width = $w;
$height = $h;
IF($width>$Dw){
$Par=$Dw /$width;
$width=$Dw;
$height=$height*$Par;
IF($height>$Dh){
$Par=$Dh/$height;
$height=$Dh;
$ width=$width*$Par;
}
}ElseIF($height>$Dh){
$Par=$Dh/$height;
$height=$Dh;
$width=$width*$Par;
IF ($width>$Dw){
$Par=$Dw/$width;
$width=$Dw;
$height=$height*$Par;
}
}Else{
$width=$width;
$ height=$height;
}
$nImg =ImageCreateTrueColor($width,$height); #Create a new true color canvas
ImageCopyReSampled($nImg,$Img,0,0,0,0,$width,$height,$ w,$h); #Resample copy part of the image and resize it
ImageJpeg($nImg,$Image); #Output the image to the browser or file in JPEG format
ReturnTrue;
#If you are performing a thumbnail generation operation, then
}Else{
$w=ImagesX($Img);
$h=ImagesY($Img);
$width = $w;
$height = $h;
$nImg =ImageCreateTrueColor($Dw,$Dh);
IF($h/$w>$Dh/$Dw){#Height is larger
$width=$Dw;
$height=$h*$Dw/$w;
$IntNH=$height-$Dh;
ImageCopyReSampled($nImg, $Img,0,-$IntNH/1.8,0,0, $Dw, $height, $w, $h);
}Else{ #Width Relatively large
$height=$Dh;
$width=$w*$Dh/$h;
$IntNW=$width-$Dw;
ImageCopyReSampled($nImg, $Img,-$IntNW/1.8,0,0 ,0, $width, $Dh, $w, $h);
}
ImageJpeg($nImg,$Image);
ReturnTrue;
}
}
?>

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2. Call example

The file types allowed to be uploaded are:

/**
Image compression processing
*/
if($_SERVER ['REQUEST_METHOD']=='POST'){
if(!is_uploaded_file($_FILES["photo"][tmp_name])){
echo "The picture does not exist";
exit();
}
if(!is_dir('img')){//Create the path if it does not exist
mkdir('img');
}
$upfile=$_FILES ["photo"];
$pinfo=pathinfo($upfile["name"]);
$name=$pinfo['basename'];//File name
$tmp_name=$upfile["tmp_name"];
$file_type=$pinfo['extension'];//Get the file type
$showphpath=$path.$name;

if(in_array($upfile["type"],$phtypes)){
echo "File type Not consistent! ";
exit();
}
if(move_uploaded_file($tmp_name,$path.$name)){
echo "Success! ";
Img($showphpath,100,800,2);
}
echo "";
}
?>
< ;/html>
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php图片压缩的实现代码

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